Q(56-60): In a talk show, there are 7 chairs in a row - opposite to the host of the program. Seven discussants A, B, C, D, X, Y, and Z. will participate in the talk show. The chairs are numbered 1 to 7 from left to right. The sitting plan must be done according to the following conditions: A must occupy 1st, 2nd or 3rd chair. C must sit immediately before B. D cannot sit in the 1st or last chair. X must sit either in the 1st or last chair. Y must be on one of the last three chairs. 56. Which of the following is an acceptable order for the sitting arrangement?